顶空气相色谱法测定血液中乙醇含量

本文建立了用顶空气相色谱法测定血液中乙醇含量的方法,用正丁醇作内标,取０．２ｍＬ血样,６０℃平衡３０ｍｉｎ,相对误差小于３％。方法简单,结果准确,无需样品处理,可以满足各种浓度血液样品的测定。     

Acquisition of a deliberately introduced phenol degradation operon, pheBA, by different indigenous Pseudomonas species

Horizontal transfer of genes of selective value in an environment 6 years after their introduction into a watershed has been observed. Expression of the gene pheA, which encodes phenol monooxygenase and is linked to the pheBA operon (A. Nurk, L. Kasak, and M. Kivisaar, Gene 102:13-18, 1991), allows pseudomonads to use phenol as a growth substrate. Pseudomonas putida strains carrying this operon on a plasmid were used for bioremediation after an accidental fire in the Estonia oil shale mine in Estonia in 1988. The water samples used for studying the fate of the genes introduced were collected in 1994. The same gene cluster was also detected in Pseudomonas strains isolated from water samples of a nearby watershed which has been continuously polluted with phenols due to oil shale industry leachate. Together with the more frequently existing counterparts of the dmp genes (V. Shingler, J. Powlowski, and U. Marklund, J. Bacteriol. 174:711-724, 1992), the pheA gene was also represented in the phenol-degrading strains. The area where the strains containing the pheA gene were found was restricted to the regular route of phenolic leachate to the Baltic Sea. Nine Pseudomonas strains belonging to four different species (P. corrugata, P. fragi, P. stutzeri, and P. fluorescens biotypes B, C, and F) and harboring horizontally transferred pheBA operons were investigated. The phe genes were clustered in the same manner in these nine phe operons and were connected to the same promoter as in the case of the original pheBA operon. One 10.6-kb plasmid carrying a pheBA gene cluster was sequenced, and the structure of the rearranged pheBA operon was described. This data indicates that introduced genetic material could, if it encodes a beneficial capability, enrich the natural genetic variety for biodegradation.     

欧元——挑战和制约美元

阐述了欧元的产生对美元在世界经济中的地位的影响，指出了欧元对整个世界经济的重要意义。     

内返料内分级喷浆造粒干燥机结构改进的探讨

本文评述内返料内级喷浆造粒干燥机的改进方案及其效果，并提出３点改进建议。     

Chest radiography in the ICU

Proper positioning and assessment of abnormalities and complications of the above-mentioned devices have a significant impact on the management of critically ill patients in the intensive care unit (ICU). The timely assessment of new or rapidly evolving findings is critical. Optimal radiographic technique, availability of images to the clinicians, and rapid reporting by the radiologist all serve to maximize the efficacy of bedside chest radiography in the ICU. Sometimes, changes in cardiopulmonary status may only be appreciated on chest radiographs (CXRs). Complications from ventilatory assistance, such as barotrauma, occur frequently and must be detected promptly. The position of monitoring devices, an important component of critical care management, is best checked radiographically. Indications for CXRs and the recommended frequency for repeat follow-up CXRs are based on the existing literature and the consensus of an expert panel formed by the American College of Radiology.     

An automated approach to information systems decomposition

A method for automating the process of system decomposition is described. The method is based on a formal specification scheme, formal definition of good decomposition, heuristic rules governing the search for good candidate decompositions, and a measure of complexity that allows ranking of the candidate decompositions. The decomposition method has been implemented as a set of experimental computerized systems analysis tools and applied to a standard problem for which other designs already exist. The results are encouraging, in that decompositions generated using other methodologies map easily into those suggested by the computerized tools. Additionally, the use of the method indicates that when more than one `good' decomposition is suggested by the system, the specifications might have been incomplete. That is, the computerized tools can identify areas where more information should be sought by analysis     

Symmetry‐Aware Template Deformation and Fitting

In this paper, we propose a new method for reconstructing 3D models from a noisy and incomplete 3D scan and a coarse template model. The main idea is to maintain characteristic high‐level features of the template that remain unchanged for different variants of the same type of object. As invariants, we chose the partial symmetry structure of the template model under Euclidian transformations, i.e. we maintain the algebraic structure of all reflections, rotations and translations that map the object partially to itself. We propose an optimization scheme that maintains continuous and discrete symmetry properties of this kind while registering a template against scan data using a deformable iterative closest points (ICP) framework with thin‐plate‐spline regularization. We apply our new deformation approach to a large number of example data sets and demonstrate that symmetry‐guided template matching often yields much more plausible reconstructions than previous variants of ICP.     

葛洲坝500kV MOA事故分析及反事故措施

本文扼要地介绍了葛洲坝电厂500kVMOA3次事故的情况，分析了事故原因，并给出了人工污秽试验和加裙位置优化计算的结果并介绍了实施反事故措施后安全运行一年多的情况。